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Double JPEG compression Main idea / background ◮ digital images are often already JPEGs before being further processed ◮ digital images are often re-saved as JPEGs after processing ◮ usually, we will see different quantization tables Gloe & Kirchner Digital Image Forensics slide 38
Double JPEG compression Main idea / background ◮ digital images are often already JPEGs before being further processed ◮ digital images are often re-saved as JPEGs after processing ◮ usually, we will see different quantization tables quantization of DCT coefficients QFpre pre-compression post-compression quantization factor q0 » – c cq0 = q0 = QFpost quantization factor q1 " » – # c q0 c (q0,q = 1) q0 q1 Gloe & Kirchner Digital Image Forensics slide 38
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I know what you have done in your l
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This is actually not from a horror
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This is actually not from a horror
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. . . yet it is as scary, at least.
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. . . yet it is as scary, at least.
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Authenticity of images in the digit
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Digital image forensics: a first gl
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Two introductory examples ◮ digit
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1 After all, it’s all about bits
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By the way, what is computer forens
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By the way, what is computer forens
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Digital forensics: proposed ontolog
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WARNING! The following slides inten
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Computer forensics = Image forensic
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Computer forensics = Image forensic
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Computer forensics: a closer look p
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suspicious traces? Computer forensi
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suspicious traces? Computer forensi
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Image forensics: a closer look orig
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Image forensics: a closer look orig
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Sensors: a source of uncertainty
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Sensors: a source of uncertainty
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Models: yet another dimensionality
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Models: yet another dimensionality
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Fundamentals of digital image foren
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Page 67 and 68: Fundamentals of digital image foren
Page 75 and 76: Image source identification goal: d
Page 77 and 78: Intra- and inter-model similarities
Page 79 and 80: Camera model identification ◮ mos
Page 81 and 82: Some results on camera model identi
Page 83 and 84: Camera model identification: overal
Page 85 and 86: Camera device identification ◮ mo
Page 87 and 88: Camera device identification ◮ mo
Page 89 and 90: A typical noise residual Wavelet de
Page 91 and 92: correlation coefficient Was it your
Page 93 and 94: Image source identfication: Summary
Page 95 and 96: Need a break? Ooops. . . submission
Page 97 and 98: Image manipulation detection Digita
Page 103 and 104: Resampling detection ◮ image mani
Page 105 and 106: Resampling detection scheme example
Page 107 and 108: Resampling detection scheme ωt ′
Page 109 and 110: Resampling detection scheme ωt ′
Page 111 and 112: It’s not only the biggest potato
Page 113 and 114: Color filter array interpolation
Page 115 and 116: Example application of CFA artifact
Page 117: Example application of CFA artifact
Page 121 and 122: Double JPEG compression artifacts Q
Page 123 and 124: Church of our Ladies, Dresden A typ
Page 125 and 126: . . . and a practical application J
Page 127 and 128: 3Digital image forensics requires i
Page 129 and 130: How does your algorithm know that t
Page 131 and 132: How to capture 14 000 images . . .
Page 133: min / max temperature [ ◦ C] 8 4
Page 136 and 137: DOCMA Award Background ◮ creating
Page 138 and 139: DOCMA Award: some examples Original
Page 144 and 145: 4Now that we have the theory behind
Page 146 and 147: Digital forensics: proposed ontolog
Page 148 and 149: Counter-forensics: computer forensi
Page 154 and 155: Counter-forensics: image forensics
Page 156 and 157: Attacks: practical considerations W
Page 158 and 159: fin Concluding remarks
Page 160 and 161: Multimedia forensics: a growing fie
Page 162 and 163: A broader view 2 2 7 7 ICSI 2010 2A
Page 164 and 165: Computer forensics in a broader sen
Page 166 and 167: Computer forensics in a broader sen
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Image sources ⊲ Photoshop logo (t
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